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4. Rare earth alloys
The appearance of these metal alloys around the 1960s represented a huge advance in the field of permanent magnets, thanks to their magnetic properties. Compared with other existing magnets, rare-earth magnets have a very high volumetric energy density and high resistance to demagnetization.
This family includes :
samarium-cobalt magnets ;
neodymium-iron-boron magnets.
4.1 Samarium-cobalt alloys
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Rare earth alloys
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Standardization
- Magnetic materials – Method for measuring the coercive field of magnetic materials in an open magnetic circuit (classification index: C28-921) - NF EN 10330 - 08-03
- Magnetic materials – Materials for permanent magnets (magnetically hard) – Methods for measuring magnetic properties (Classification index: C28-919) - NF EN 10332 - 03-04
- Quantities and units – General principles. - NF X02-001 - 12-93
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Groupe de Physique des Matériaux GPM – University of Rouen http://www.univ-rouen.fr/gpm/
Néel Institute – CNRS Grenoble http://neel.cnrs.fr/
Grenoble Electrical Engineering Laboratory
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